diff --git a/.gitignore b/.gitignore
index e8b12f9..a6d7623 100644
--- a/.gitignore
+++ b/.gitignore
@@ -90,7 +90,7 @@ ipython_config.py
 # pyenv
 #   For a library or package, you might want to ignore these files since the code is
 #   intended to run in multiple environments; otherwise, check them in:
-# .python-version
+.python-version
 
 # pipenv
 #   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
diff --git a/CONTRIBUTORS.rst b/CONTRIBUTORS.rst
index 933a4be..fae3a43 100644
--- a/CONTRIBUTORS.rst
+++ b/CONTRIBUTORS.rst
@@ -1,10 +1,11 @@
 
 
-3 contributors
+4 contributors
 ================================================================================
 
 In alphabetical order:
 
 * `Benoit Pierre <https://github.com/benoit-pierre>`_
+* `Craig Anderson <https://github.com/craiga>`_
 * `John Vandenberg <https://github.com/jayvdb>`_
 * `Stephen J. Fuhry <https://github.com/fuhrysteve>`_
diff --git a/changelog.yml b/changelog.yml
index e29bbef..72b1569 100644
--- a/changelog.yml
+++ b/changelog.yml
@@ -1,6 +1,10 @@
 name: pyexcel-xlsx
 organisation: pyexcel
 releases:
+- changes:
+  - action: Updated
+    details:
+    - 'Compatability with openpyxl 3.1.0 and later'
 - changes:
   - action: Updated
     details:
diff --git a/pyexcel_xlsx/xlsxr.py b/pyexcel_xlsx/xlsxr.py
index cfa7cee..c32f82c 100644
--- a/pyexcel_xlsx/xlsxr.py
+++ b/pyexcel_xlsx/xlsxr.py
@@ -69,7 +69,7 @@ def __init__(self, sheet, **keywords):
         self.max_column = 0
         self.__sheet_max_row = sheet.max_row
         self.__sheet_max_column = sheet.max_column
-        for ranges in sheet.merged_cells.ranges[:]:
+        for ranges in list(sheet.merged_cells.ranges)[:]:
             merged_cells = MergedCell(ranges)
             merged_cells.register_cells(self.__merged_cells)
             if self.max_row < merged_cells.bottom_row():
diff --git a/tests/base.py b/tests/base.py
index 71474a3..08338bc 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -83,7 +83,7 @@ def test_reading_through_sheets(self):
         expected = [[4, 4, 4, 4], [5, 5, 5, 5], [6, 6, 6, 6]]
         assert data == expected
         data = list(b["Sheet3"].rows())
-        expected = [[u"X", u"Y", u"Z"], [1, 4, 7], [2, 5, 8], [3, 6, 9]]
+        expected = [["X", "Y", "Z"], [1, 4, 7], [2, 5, 8], [3, 6, 9]]
         assert data == expected
         sheet3 = b["Sheet3"]
         sheet3.name_columns_by_row(0)
diff --git a/tests/test_multiple_sheets.py b/tests/test_multiple_sheets.py
index 7c5160f..50e2ff9 100644
--- a/tests/test_multiple_sheets.py
+++ b/tests/test_multiple_sheets.py
@@ -247,6 +247,6 @@ def _produce_ordered_dict():
     data_dict.update({"Sheet1": [[1, 1, 1, 1], [2, 2, 2, 2], [3, 3, 3, 3]]})
     data_dict.update({"Sheet2": [[4, 4, 4, 4], [5, 5, 5, 5], [6, 6, 6, 6]]})
     data_dict.update(
-        {"Sheet3": [[u"X", u"Y", u"Z"], [1, 4, 7], [2, 5, 8], [3, 6, 9]]}
+        {"Sheet3": [["X", "Y", "Z"], [1, 4, 7], [2, 5, 8], [3, 6, 9]]}
     )
     return data_dict
diff --git a/tests/test_reader.py b/tests/test_reader.py
index 87a4da7..bfb4958 100644
--- a/tests/test_reader.py
+++ b/tests/test_reader.py
@@ -1,17 +1,17 @@
 import os
-from datetime import datetime, time
+from datetime import time, datetime
 
-from nose.tools import eq_
+from pyexcel_xlsx import get_data
 from pyexcel_io._compact import OrderedDict
 
-from pyexcel_xlsx import get_data
+from nose.tools import eq_
 
 
 def test_reading():
     data = get_data(
         os.path.join("tests", "fixtures", "date_field.xlsx"),
         library="pyexcel-xlsx",
-        skip_hidden_row_and_column=False
+        skip_hidden_row_and_column=False,
     )
     expected = OrderedDict()
     expected.update(
diff --git a/tests/test_writer.py b/tests/test_writer.py
index b54d556..8575f63 100644
--- a/tests/test_writer.py
+++ b/tests/test_writer.py
@@ -10,7 +10,7 @@ def test_write_book(self):
         self.content = {
             "Sheet1": [[1, 1, 1, 1], [2, 2, 2, 2], [3, 3, 3, 3]],
             "Sheet2": [[4, 4, 4, 4], [5, 5, 5, 5], [6, 6, 6, 6]],
-            "Sheet3": [[u"X", u"Y", u"Z"], [1, 4, 7], [2, 5, 8], [3, 6, 9]],
+            "Sheet3": [["X", "Y", "Z"], [1, 4, 7], [2, 5, 8], [3, 6, 9]],
         }
         self.testfile = "writer.xlsx"
         writer = Writer(self.testfile, "xlsx")